Client limit upload bandwidth

Hi All,
First, I tried to search on the forum, information to limit the bandwidth of the clients but I not found answer.
We have multiple client (windows, linux, android) and multiple connection (Adsl, 4g…)
For example when I tried to launch the first sync with a folder with 800 Mo, on the windows client, it take all the bandwidth of the adsl connection, and the internet navigation is very slow.
I tried to search a parameter to limit the upload bandwidth and I not found.
And for me the limit rate on the nginx configuration is not the solution because it depends of the connection.
Do you have some information or other to found for each client how to limit the bandwidth.
Thanks you